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This CL does the following:

1. Use VpxVideoDecoder in utility process to do software decoding for
vp8, vp9 video files.

2. Simplify the class to render media::VideoFrame into bitmap, since
PaintCanvasVideoRenderer works for all kind of VideoFrames.

3. Do not retrieve poster image from metadata. The mime type of the
poster image is inferred from mime sniffer, and needs to be
processed in sandbox process.


Bug: 826021
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I91c9cf72a75be4bc3a95203a40633647e079a40a
Reviewed-on: https://chromium-review.googlesource.com/1234859
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595523}